855973440 has 224 divisors, whose sum is σ = 3451311360. Its totient is φ = 195637248.

The previous prime is 855973387. The next prime is 855973463. The reversal of 855973440 is 44379558.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53404 + ... + 67556.

It is an arithmetic number, because the mean of its divisors is an integer number (15407640).

Almost surely, 2^855973440 is an apocalyptic number.

855973440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855973440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1725655680).

855973440 is an abundant number, since it is smaller than the sum of its proper divisors (2595337920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855973440 is a wasteful number, since it uses less digits than its factorization.

855973440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14186 (or 14170 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 855973440 is about 29257.0237720791. The cubic root of 855973440 is about 949.4820593133.

The spelling of 855973440 in words is "eight hundred fifty-five million, nine hundred seventy-three thousand, four hundred forty".